Description:
file [D:\project\carshow-server\server-flowable\flowable-admin\target\classes\com\carshow\flowable\mapper\IFlowableCommentMapper.class] required a single bean, but 2 were found:
- sqlSessionFactory: defined by method 'sqlSessionFactory' in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]
- modelerSqlSessionFactory: defined by method 'modelerSqlSessionFactory' in class path resource [org/flowable/ui/modeler/conf/ModelerDatabaseConfiguration.class]
Action:
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
MybatisPlus： MybatisPlusAutoConfiguration.class
Flowable：ModelerDatabaseConfiguration.class
@ConditionalOnMissingBean：它是修饰bean的一个注解，主要实现的是，当你的bean被注册之后，如果有注册相同类型的bean，就不会成功，它会保证你的bean只有一个，即你的实例只有一个，当你注册多个相同的bean时，会出现异常，以此来告诉开发人员。
所以问题就来了，找到了这两个bean冲突，接下来如何进行解决呢，查看了一下源码并查阅了其他大佬的技术博客，记录一下
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusProperties;
import com.baomidou.mybatisplus.autoconfigure.SpringBootVFS;
import com.baomidou.mybatisplus.core.MybatisConfiguration;
import com.baomidou.mybatisplus.core.config.GlobalConfig;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.baomidou.mybatisplus.core.incrementer.IKeyGenerator;
import com.baomidou.mybatisplus.core.injector.ISqlInjector;
import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.context.ApplicationContext;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.StringUtils;
import javax.sql.DataSource;
import java.util.List;
/**
* @author xw
* @description 重写mybatis-plus 自动配置类
* @date 2022/1/7 14:06
*/
public class AbstractMybatisPlusConfiguration {
protected SqlSessionFactory getSqlSessionFactory(
DataSource dataSource,
MybatisPlusProperties properties,
ResourceLoader resourceLoader,
Interceptor[] interceptors,
DatabaseIdProvider databaseIdProvider,
ApplicationContext applicationContext
) throws Exception {
MybatisSqlSessionFactoryBean factory = new MybatisSqlSessionFactoryBean();
factory.setDataSource(dataSource);
factory.setVfs(SpringBootVFS.class);
if (StringUtils.hasText(properties.getConfigLocation())) {
factory.setConfigLocation(resourceLoader.getResource(properties.getConfigLocation()));
}
applyConfiguration(factory, properties);
if (properties.getConfigurationProperties() != null) {
factory.setConfigurationProperties(properties.getConfigurationProperties());
}
if (!ObjectUtils.isEmpty(interceptors)) {
factory.setPlugins(interceptors);
}
if (databaseIdProvider != null) {
factory.setDatabaseIdProvider(databaseIdProvider);
}
if (StringUtils.hasLength(properties.getTypeAliasesPackage())) {
factory.setTypeAliasesPackage(properties.getTypeAliasesPackage());
}
// TODO 自定义枚举包
if (StringUtils.hasLength(properties.getTypeEnumsPackage())) {
factory.setTypeEnumsPackage(properties.getTypeEnumsPackage());
}
if (properties.getTypeAliasesSuperType() != null) {
factory.setTypeAliasesSuperType(properties.getTypeAliasesSuperType());
}
if (StringUtils.hasLength(properties.getTypeHandlersPackage())) {
factory.setTypeHandlersPackage(properties.getTypeHandlersPackage());
}
if (!ObjectUtils.isEmpty(properties.resolveMapperLocations())) {
factory.setMapperLocations(properties.resolveMapperLocations());
}
// TODO 此处必为非 NULL
GlobalConfig globalConfig = properties.getGlobalConfig();
//注入填充器
if (applicationContext.getBeanNamesForType(MetaObjectHandler.class,
false, false).length > 0) {
MetaObjectHandler metaObjectHandler = applicationContext.getBean(MetaObjectHandler.class);
globalConfig.setMetaObjectHandler(metaObjectHandler);
}
//注入主键生成器
if (applicationContext.getBeanNamesForType(IKeyGenerator.class, false,
false).length > 0) {
IKeyGenerator keyGenerator = applicationContext.getBean(IKeyGenerator.class);
globalConfig.getDbConfig().setKeyGenerators((List<IKeyGenerator>) keyGenerator);
}
//注入sql注入器
if (applicationContext.getBeanNamesForType(ISqlInjector.class, false,
false).length > 0) {
ISqlInjector iSqlInjector = applicationContext.getBean(ISqlInjector.class);
globalConfig.setSqlInjector(iSqlInjector);
}
factory.setGlobalConfig(globalConfig);
return factory.getObject();
}
private void applyConfiguration(MybatisSqlSessionFactoryBean factory, MybatisPlusProperties properties) {
MybatisConfiguration configuration = properties.getConfiguration();
if (configuration == null && !StringUtils.hasText(properties.getConfigLocation())) {
configuration = new MybatisConfiguration();
}
// if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) {
// for (ConfigurationCustomizer customizer : this.configurationCustomizers) {
// customizer.customize(configuration);
// }
// }
factory.setConfiguration(configuration);
}
public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory, MybatisPlusProperties properties) {
ExecutorType executorType = properties.getExecutorType();
if (executorType != null) {
return new SqlSessionTemplate(sqlSessionFactory, executorType);
} else {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
}
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusProperties;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ResourceLoader;
import javax.sql.DataSource;
/**
* @author xw
* @description
* @date 2022/1/7 16:24
*/
@MapperScan(
sqlSessionTemplateRef = "mySqlSessionTemplate",
sqlSessionFactoryRef = "mySqlSessionFactory"
)
@EnableConfigurationProperties(MybatisPlusProperties.class)
@Configuration
public class MybatisPlusConfiguration extends AbstractMybatisPlusConfiguration {
@Bean(name = "mySqlSessionFactory")
public SqlSessionFactory sqlSessionFactoryBean(DataSource dataSource,
MybatisPlusProperties properties,
ResourceLoader resourceLoader,
ApplicationContext applicationContext) throws Exception {
return getSqlSessionFactory(dataSource,
properties,
resourceLoader,
null,
null,
applicationContext);
}
@Bean(name = "mySqlSessionTemplate")
public SqlSessionTemplate sqlSessionTemplate(MybatisPlusProperties properties,
@Qualifier("mySqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return getSqlSessionTemplate(sqlSessionFactory, properties);
}
}
import liquibase.Liquibase;
import liquibase.database.Database;
import liquibase.database.DatabaseConnection;
import liquibase.database.DatabaseFactory;
import liquibase.database.jvm.JdbcConnection;
import liquibase.exception.DatabaseException;
import liquibase.resource.ClassLoaderResourceAccessor;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.session.SqlSessionFactory;
import org.flowable.common.engine.api.FlowableException;
import org.flowable.ui.common.service.exception.InternalServerErrorException;
import org.flowable.ui.modeler.properties.FlowableModelerAppProperties;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.ResourcePatternUtils;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.Properties;
/**
* @author xw
* @description 重写 flowable-modeler 中 ModelerDatabaseConfiguration
* @date 2022/1/7 16:31
*/
@Configuration
@Slf4j
public class DatabaseConfiguration {
protected static final String LIQUIBASE_CHANGELOG_PREFIX = "ACT_DE_";
@Autowired
protected FlowableModelerAppProperties modelerAppProperties;
@Autowired
protected ResourceLoader resourceLoader;
protected static Properties databaseTypeMappings = getDefaultDatabaseTypeMappings();
public static final String DATABASE_TYPE_H2 = "h2";
public static final String DATABASE_TYPE_HSQL = "hsql";
public static final String DATABASE_TYPE_MYSQL = "mysql";
public static final String DATABASE_TYPE_ORACLE = "oracle";
public static final String DATABASE_TYPE_POSTGRES = "postgres";
public static final String DATABASE_TYPE_MSSQL = "mssql";
public static final String DATABASE_TYPE_DB2 = "db2";
public static Properties getDefaultDatabaseTypeMappings() {
Properties databaseTypeMappings = new Properties();
databaseTypeMappings.setProperty("H2", DATABASE_TYPE_H2);
databaseTypeMappings.setProperty("HSQL Database Engine", DATABASE_TYPE_HSQL);
databaseTypeMappings.setProperty("MySQL", DATABASE_TYPE_MYSQL);
databaseTypeMappings.setProperty("Oracle", DATABASE_TYPE_ORACLE);
databaseTypeMappings.setProperty("PostgreSQL", DATABASE_TYPE_POSTGRES);
databaseTypeMappings.setProperty("Microsoft SQL Server", DATABASE_TYPE_MSSQL);
databaseTypeMappings.setProperty(DATABASE_TYPE_DB2, DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/NT", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/NT64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDP", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUX390", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXX8664", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXZ64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXPPC64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/400 SQL", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/6000", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDB iSeries", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/AIX64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/HPUX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/HP64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/SUN", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/SUN64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/PTX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/2", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDB AS400", DATABASE_TYPE_DB2);
return databaseTypeMappings;
}
@Bean
@Primary
public SqlSessionFactory sqlSessionFactory(DataSource dataSource) {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);
String databaseType = initDatabaseType(dataSource);
if (databaseType == null) {
throw new FlowableException("couldn't deduct database type");
}
try {
Properties properties = new Properties();
properties.put("prefix", modelerAppProperties.getDataSourcePrefix());
properties.put("blobType", "BLOB");
properties.put("boolValue", "TRUE");
properties.load(this.getClass().getClassLoader().getResourceAsStream("org/flowable/db/properties/" + databaseType + ".properties"));
sqlSessionFactoryBean.setConfigurationProperties(properties);
sqlSessionFactoryBean
.setMapperLocations(ResourcePatternUtils.getResourcePatternResolver(resourceLoader).getResources("classpath:/META-INF/modeler-mybatis-mappings/*.xml"));
sqlSessionFactoryBean.afterPropertiesSet();
return sqlSessionFactoryBean.getObject();
} catch (Exception e) {
throw new FlowableException("Could not create sqlSessionFactory", e);
}
}
@Primary
@Bean(destroyMethod = "clearCache") // destroyMethod: see https://github.com/mybatis/old-google-code-issues/issues/778
public SqlSessionTemplate SqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
@Bean
public Liquibase liquibase(DataSource dataSource) {
log.info("Configuring Liquibase");
Liquibase liquibase = null;
try {
DatabaseConnection connection = new JdbcConnection(dataSource.getConnection());
Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(connection);
database.setDatabaseChangeLogTableName(LIQUIBASE_CHANGELOG_PREFIX + database.getDatabaseChangeLogTableName());
database.setDatabaseChangeLogLockTableName(LIQUIBASE_CHANGELOG_PREFIX + database.getDatabaseChangeLogLockTableName());
liquibase = new Liquibase("META-INF/liquibase/flowable-modeler-app-db-changelog.xml", new ClassLoaderResourceAccessor(), database);
liquibase.update("flowable");
return liquibase;
} catch (Exception e) {
throw new InternalServerErrorException("Error creating liquibase database", e);
} finally {
closeDatabase(liquibase);
}
}
protected String initDatabaseType(DataSource dataSource) {
String databaseType = null;
Connection connection = null;
try {
connection = dataSource.getConnection();
DatabaseMetaData databaseMetaData = connection.getMetaData();
String databaseProductName = databaseMetaData.getDatabaseProductName();
log.info("database product name: '{}'", databaseProductName);
databaseType = databaseTypeMappings.getProperty(databaseProductName);
if (databaseType == null) {
throw new FlowableException("couldn't deduct database type from database product name '" + databaseProductName + "'");
}
log.info("using database type: {}", databaseType);
} catch (SQLException e) {
log.error("Exception while initializing Database connection", e);
} finally {
try {
if (connection != null) {
connection.close();
}
} catch (SQLException e) {
log.error("Exception while closing the Database connection", e);
}
}
return databaseType;
}
private void closeDatabase(Liquibase liquibase) {
if (liquibase != null) {
Database database = liquibase.getDatabase();
if (database != null) {
try {
database.close();
} catch (DatabaseException e) {
log.warn("Error closing database", e);
}
}
}
}
}
